> M1 with all its CPUs pegged to 100% only hits 20W, so M1 still uses way less power than single core in Zen.

So do Ryzen CPUs. The 16 core Ryzen only needs 5W per core. It's purely a matter of frequency management.

These comparisons are meaningless because you can say stupid things like "Ryzens are more power efficient than Ryzens" and still be right.